Brian, to do that, I would need of course a red filter that excludes hydrogen alpha. My current R filter lets it all in. Custom Scientific makes such a filter, they call a "continuum" filter. Alls it takes is money... ;) Chris --- Brian Skiff <bas@xxxxxxxxxx> wrote: > Have you tried getting a 'pure' H-alpha image? > That is, > make a composite that consists of the H-alpha image > _minus_ the R image > to take out the red continuum from stars. > > \Brian > -- > See message header for info on list archives or > unsubscribing, and please > send personal replies to the author, not the list. > > Take Care, Chris Astro: http://www.schursastrophotography.com Robotics: http://www.schursastrophotography.com/roboticsmain.html ____________________________________________________________________________________ Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.